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Sasuke explained that he could use Tailed Beast Chakra earlier on from the Chibaku Tensei Naruto Manga 697 to release Infinite Tsukuyomi, hence why he doesn't need Naruto. You could say it's similar to when Sasuke was using Jugo's senjutsu chakra to add to his Susano'o. Sasuke has absorbed Tailed Beast Chakra via Chibaku Tensei into his Susano'o to empower it.